31 Input/output library [input.output]

31.7 Formatting and manipulators [iostream.format]

31.7.5 Input streams [input.streams]

31.7.5.2 Class template basic_istream [istream]

31.7.5.2.3 Assignment and swap [istream.assign]

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basic_istream& operator=(basic_istream&& rhs);
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Effects: Equivalent to swap(rhs).
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Returns: *this.
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void swap(basic_istream& rhs);
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Effects: Calls basic_ios<charT, traits>​::​swap(rhs).
Exchanges the values returned by gcount() and rhs.gcount().